Tumors and cancers are insidious diseases characterized by uncontrolled growth of abnormal cells that extend beyond their usual boundaries and disrupt the normal functions of affected organs. Forming the second of the four volumes devoted to tumors and cancers, this volume focuses on the head/neck, cardiovascular, respiratory and digestive systems. Each chapter presents a state of the art summary of tumor/cancer of a particular organ/type in relation to its definition, biology, epidemiology, disease mechanism/pathogenesis, clinical signs, diagnosis, treatment and prognosis.